Any function that call itself can be regarded as recursive function, it should be noted that Recursion is a natural use for a stack, especially in the area of book keeping.
Recursion is very important because some of problems are usually recursive in nature such as Graph and others, and when dealing with recursion , only base and recursive case is needed to be defined.
Some areas where recursion is used are in sorting and searching.
This is usually just a small glitch that happens sometimes when you are seeing an ad and wanting to skip. Simple fixes to this problem include refreshing the browser or closing the application that you are in. This also would happen to me but following this fix should help with the problem.
